mirror of
https://github.com/ntop/ntopng.git
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64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/*
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*
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* (C) 2020 - ntop.org
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef _CARDINALITY_H_
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#define _CARDINALITY_H_
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#include "ntop_includes.h"
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/* ******************************* */
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class Cardinality {
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private:
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struct ndpi_hll hll;
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public:
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Cardinality() {
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memset(&hll, 0, sizeof(hll));
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}
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~Cardinality() {
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ndpi_hll_destroy(&hll);
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}
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void init(u_int8_t bits) {
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if(ndpi_hll_init(&hll, bits))
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throw "init error";
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}
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void addElement(const char *value, size_t value_len) {
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ndpi_hll_add(&hll, value, value_len);
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}
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void addElement(u_int32_t value) {
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ndpi_hll_add_number(&hll, value);
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}
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u_int32_t getEstimate() {
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return((u_int32_t)ndpi_hll_count(&hll));
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}
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void reset() {
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memset(hll.registers, 0, hll.size); /* A lock might help here... */
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}
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};
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#endif /* _CARDINALITY_H_ */
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